Attic Mold - Correct Ventilatoin

We never had an issue with mold in the attic. Prior attic set-up was gable end vents, sofit vents and exhaust fan. After putting on a new roof and adding a ridge vent, (center of roof), we are now noticing mold in one major area. Should we cover the gable end vents? And also, is there a way to deal with the mold without calling in professionals? Thanks!

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Attic Mold - Correct Ventilatoin

You should have good air circulation so NO, don't close off the soffit vents. I would check for leaks where you notice the mold. There just may be a nail hole in the newly surfaced roof. If so, patch it. There is also a product (a spray bottle) for killing mold. (Home Depot or others). About $10.00/bottle. If the mold is minor, this should do the trick. Try to find the source for the mold and fix that. Mold requires moisture os there must be some cause.
Good luck.

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Attic Mold - Correct Ventilatoin

When the new roof with the ridge vents were installed, was the gable end louvre vents sealed off and/or was the powered attic vent removed?

If not, then the intake air is now taking the path of least resistance and the fresh air intake source would be the gable end vents instead of the soffit vents.

Also, the amount and net free area of ventilation for each ventiolation product needs to be determined and considered in the equation. More often than not, there is substantially insufficient amounts of intake vents along the soffit area of the home and now they are reduced to being functionless due to being short-circuiting the proper air flow from the gable vents functioning in place of the soffit vents.

This is all speculation of course until you actually clarify some points I made assumptions on that are quite common in real world experience.

Attic Mold - Correct Ventilatoin

Quote:

Originally Posted by michelle239

We never had an issue with mold in the attic. Prior attic set-up was gable end vents, sofit vents and exhaust fan. After putting on a new roof and adding a ridge vent, (center of roof), we are now noticing mold in one major area. Should we cover the gable end vents? And also, is there a way to deal with the mold without calling in professionals? Thanks!

Is that major area over a bathroom or the kitchen? You may have an un-ducted exhaust fan blowing into the attic.